O2 sensor "analyzer"
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Posting Guru
Joined: Aug 2002
Posts: 1,493
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From: Great NW
O2 sensor "analyzer"
I am in the process of tuning a Holley 650 carb on a formerly EFI engine. I figure that the best and most efficient way of tuning the carb is to utilize the stock 4-pin o2 sensors to analyze the exhaust and make adjustments based on that.
I understand that one can purchase these analyzers, but honestly, I doubt that I will ever need to adjust my carb after I get it done right the first time and would then be wasting money on a tool I will never use again.
Does anyone have one of these items they would consider renting to a boardmate for a few days (with a damage deposit of course)? It must be able to plug into the Ford 4-pin o2 sensors.
Thanks and any help would be appreciated.
Donny (Seattle)
I understand that one can purchase these analyzers, but honestly, I doubt that I will ever need to adjust my carb after I get it done right the first time and would then be wasting money on a tool I will never use again.
Does anyone have one of these items they would consider renting to a boardmate for a few days (with a damage deposit of course)? It must be able to plug into the Ford 4-pin o2 sensors.
Thanks and any help would be appreciated.
Donny (Seattle)
Post Fiend
Joined: Apr 2002
Posts: 7,157
Likes: 1
From: Central Kali
O2 sensor "analyzer"
Hi, just pick up a cheap voltmeter. The sensor generates one volt. I would have to look it up but if it goes down it is rich or lean. With 4 wires it must have a heater to warm it up faster. Someone makes a red and green led box that shows if you are rich or lean. I have been meaning to try this.
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Joined: Jan 2001
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From: Virginia
O2 sensor "analyzer"
The oxygen sensor does produce it's own voltage. If you have voltage going to your oxygen sensors, then it's for a heater to warm the sensor up quicker, since it will not work when it's below 600 f. The voltage output is .1 to .9 volt. .1 is very lean. .9 is very rich. .450 is considered just right. The book says the white wire is for the heater, and the black wire is the one that has the output voltage to the computer on it.
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
O2 sensor "analyzer"
The HEGO has a heater circuit and a variable resistor circuit. The resistor is what you need to measure to find the quality of the exhaust, but it's only accurate when it's hot, which is the reason for the heater side. Just put ignition-switched power to the heater and measure the resistance across the sensor.
Senior User
Joined: Sep 2000
Posts: 435
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From: Central Oregon
O2 sensor "analyzer"
Go to www.bob2000.com and scroll down until you see a title on "How to tune your carburetor the scientific way", or something like that. He gives you the whole scoop on how to use an O2 sensor and DVM to super-tune your carb. Good Luck! Steve
